Luke Coley, Barry Wright, Mark Reeves and Mark Bird kidnapped the victim, and were joined at the dungeon by James Hamilton-Bing, who had rented the unit.

They admitted kidnapping and were jailed.

At the sentencing in September last year, Judge Paul Darlow said: ‘The victim was attached to the ceiling and subjected to sexual humiliation. His trousers and underwear were taken down and he was threatened with rape.’

It is only now that police have released images of the dungeon, which was then kept secret but has now been properly registered.

They were jailed

Coley, 28, of St Austell, was jailed for six years and five months, reports MailOnline.

Reeves 25, of Birmingham, was jailed for five years and seven months.

Bird, 28, of St Austell, was jailed for five years and seven months.

Hamilton-Bing, 28, of St Austell, was jailed for four years and 11 months.